| US 7,569,018 B1 | ||
| Apparatus and method for noninvasively detecting the quality of cardiac pumping | ||
| Leslie A. Geddes, Lafayette, Ind. (US); Kirk S. Foster, Lafayette, Ind. (US); and Rebecca A. Roeder, Lafayette, Ind. (US) | ||
| Assigned to Purdue Research Foundation, West Lafayette, Ind. (US) | ||
| Filed on Feb. 18, 2003, as Appl. No. 10/368,180. | ||
| Int. Cl. A61B 5/00 (2006.01) | ||
| U.S. Cl. 600—485 [600/500] | 56 Claims |
| 1. An auditory pulse monitor for noninvasively detecting the amplitude of arterial pulses in a living subject on a beat-by-beat
basis, comprising:
a light-weight optical sensor including a light source and photodetector adapted for application to a skin surface of said
subject over a tissue bed containing an arterial supply, said photodetector generating an output signal proportional to the
amplitude of an arterial pulse;
an electronic circuit connected to said photodetector for generating a signal having a frequency proportional to the instantaneous
output signal level of said photodetector, said frequency varying continuously during an individual heartbeat; and
an audio indicator connected to said electronic circuit for generating an audible tone indicating the amplitude of the arterial
pulse.
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